Marina volunteers at the Salvation Army. She has been tasked with buying nonperishable items for families that were displaced by a recent flood. She finds a company willing to sell her cans of food at a discounted price of $2.25 for a small can and $4.75 for a large can. She spent a total of $714.75 and bought 181
cans. Let x represent the number of small cans she purchased and y represent the number of large cans she purchased.

Based on this context, are there any constraints on the variables that we should consider?

A) non-negative integers greater than 2.25 and less than 4.75

B) integers greater than 0

C) no constraints are needed on the variables.

D) non-negative integers greater than 0 and less than 181.